《Big OST. Beast》的歌詞如下：
VERSE 1：
Riding on the back of the beast
Looking up at the night sky
Everyday is a new beginning
Holding onto the hope inside
CHORUS：
This is the big O.S.T
Beast is in control now
We are the ones that they fear
Running wild, we are the beast
VERSE 2：
No one knows where we are going
But we know we're not alone
Through the fire and the rain we keep moving
Holding onto our own souls
CHORUS：
This is the big O.S.T
Beast is in control now
We are the ones that they fear
Running wild, we are the beast
BRIDGE：
We are the ones that they call crazy
Running free, we won't be tamed
This is our song, this is our story
Forever in time, we will be beasts
CHORUS：
So they call us the big O.S.T
Beast is in control now
We are the ones that they fear
Running wild, we are the beast
這首歌曲表達了自由、勇敢和無畏的精神，展現了不畏艱難、勇往直前的態度。同時，它也象徵著一種不屈不撓、自我掌控的力量，以及不受束縛、追求自由的信念。